Work-support for chair-repairing machines.



P. J. TUMA.

WORK SUPPORT FOR CHAIR REPAIRING MACHINES.

APPLICATION FILED JAN.17,1914.

1,122,442, v Patented De c.29, 1914I 2 SHEETS-SHEET 1.

i 7 602} cf Tcu7zc/ I-VORRIS PETERS Ca. PHOTO-LITHQ, WASHINGTON. D. U

F. J. TUMA. WORK SUPPORT FOR CHAIR REPAIRING MACHINES.

APPLICATION FILED JAN.1'7,1914.

1 1 22,442. Patented Dec. 29, 1914.

2 SHEETS-$111111! 2.

THE NORRIS PETERS c0.. PHuTo-LITHa. WASHINGI'ON, D. C. 4

para sap ra FRANK J. TUMA, or rarer-intent), VIRGINIA.

a FK K Wonk-surreal sm CHAIR-REPAIRING naonnvns.

Specification of Letters iatent.

Application filed January 17, 1919.. Serial a... craves. f

To aZZ whom it may concern:

Be it known that I, FRANK J. TUMA, a

citizen of the; United States of America,- residing at Richmond, in the county of Henrico and State of Virginia, have invented certain new and useful Improvements 1n Work-Supports for Chair-Repairing Machines, of which the following is a specif cation. I

This invention relates to improvements in work supports for chair repairing machines.

In the art of cane seating chairs'it is customary to be provided with a form of cane fabric and the same is secured to the bottom member of a chair by provlding the latter with an annular groove and securing the fabric stretched thereover by forcing and gluing a piece of bent wood into said groove. The present invention is designed for the purpose of providing an advantageous method for supporting chair bottoms for cutting the said grooves when applying cane seat to old chairs and also for supporting chair bottoms for cutting thebent wood strips and glue from the grooves n I old chairs for the repairing of the same by recaning, or in other words while grooving and re-groovlng old chalrs of varying shapes and sizes with their grooves at dlf ferent distances from the edge of the seat.

The primary object of the invention therefore is to provide a work holder of the present novel construction designed for accomplishing the above designated objects.

The invention consistsv 111 the novel combination and arrangement of .parts herein after fully described illustrated in the ac companying drawings and po nted out 111 view of the work holder. Fig. 5 is a vertical central sectional view of the operating elements of the invention, and Fig. 6 is a detail plan View of the ratchet wheel employed therewith.

Referring more in detail to the drawings, it will be seen that wall brackets 10 are provided with a power shaft 11" journaled therein and revolvedvby the belt pulley 12, while Patented De 2a, 1914..-

a spur gear 13 upon said shaft mesheswitha the gear lt upon the driven shaft 15 jour naled in the cross member's 16 and 17 ofa framelS journaled at its upper end upon said power shaft 11. v

The lowerend of the frame 18 journals 7 the tool stock '19 upontheball bearings. 20.

, while'the. spurgears 21and 22 carried r spectlvely by the. driven shaft and stock-.-

provide for a rotation of the latter. A cir cular sa'w 23- is removably secured in operative positiontoone end of said stock as:

bythe screw 24, while a bit or auger 25 is secured with n a socket 2-6 inthe opposite end of the stock bymeans of. a set screw 27. [Gil cups 28 are preferably provided communicating with the said, bearings.

forked braceiZS secured at oneend to a; permanent support is provided with a notch in the upper side of each of its bifurcated ends 28 and adapted for the reception of p the bolts 30 vertically slidable within the slots 31 of the main frame 18 and retained in their adjusted positions by means of winged nuts. It will be evident that such I a mounting of the frame 18 allows for the imparting of a pendulum' notion thereto bolts 30 from thenotches 29. This also ,upon itsdisengagement from the brace, by loosening the nuts 32 and ,removingthe allows said bolts to drop to the bottoms of v said slots 31 leavinga free swinging movement to the said frame. When desired to rigidly retain the frame for activeoperas tions, the notches are brought into alinement with the slots 31 and the bolts placed v within said notches and tightened in the manner which will be evident. j

Positioned-directly beneath the above described mechanism there is provided the work holding device cooperating therewith which consists of the base member32 retained in the stationary position by means i of the locking devices 33 andhaving the upright tubular supporting shaftiA. mountj ed thereon. The work holding table 35 is provided with acentral depending post36- revoluble within the exterior-1y threaded sleeve 37 screw-threaded into the boss 38 mounted for rotation upon the topof said shaft 34. For the purpose of elevating and lowering the table 35 it will be seen that the boss is readily turned by means of the hand wheel 39 thereby feeding the threaded sleeve 37 with the table mounted thereon either upwardly or downwardly as desired, while said sleeve is prevented from rotation by means of the projecting pin 40 carried thereby pro ecting through the vertical side slot d1 of the shaft. A circular top flange 4:2 is provided upon said sleeve and the ratchet teeth 4-3 upon its upper surface are adapted for engagement by the pawl 4st upon the lower face of said table whereby a rotation of said table in a single direction is permitted.

'lhe table 35 is provided with sliding encircling brackets iiupon two of its oppositely projecting arms to, while the other two arms st-S of said table are provided-with slots 47 for the accommodation of blocks 48 slidably mounted therein and controlled by the turn screws LS and so as to engage either the outside or within the chair bottom for holding the latter. The arms and 46 are independently rotatable, being both journaled upon the reduced end 36 of the post 36, with the arms 46 undermost and sup porting said pawl 44):. A collar 50 upon said post 36 and revoluble therewith is positioned upon the annular untoothed portion 51 of said sleeve flange 42 and has the upper the upper face of the work so clamped upon 7 the table and if desired the table itself may not only be revolved but the saw frame may be slightly changed in position by'a swinging movement imparted thereto as above described. The boring tool 25 operating horizontally may have the work upon said table moved into operative contact therewith as desired, for instance, in making dowel sockets in the chair seats which pass transversely of the groovesmade by the saw 23 and whereby the glued strips may be retained by means of dowels placed therein.

It is evident that the entire device now disclosed is necessary for the complete accomplishment of the designed objects, but it is nevertheless to be understood that minor changes may be made in details of construction without departing from the spir t and scope of the invention as set forth in the appended claims.

sleeve and adapted for sliding engagement within said slot, a four-armed table, a central post upon said table journaled within said sleeve, ratchet teeth upon said sleeve and a pawl carried by said table adapted for engaging said teeth.

2. A. device of the class described, comprising an upright tubular shaft having a longitudinal side slot, a boss mounted for turning upon the top of said shaft, a sleeve screw-threaded within said boss and extending interiorly of said shaft, a projecting stud carried by said sleeve and adapted for sliding engagement within said slot, a post journaled within said shaft, a top flange upon said sleeve, an annular row of teeth upon the upper face of said flange, a collar upon said post revolubly seated upon the untoothed portion of said flange, and relatively shiftable arms journaled upon the top of said post.

3. A device of the class described, comprising an upright tubular shaft having a longitudinal side slot, a boss mounted for turning upon the top of said shaft, a sleeve screw-threaded within said boss and extend ing interiorly of said shaft, a projecting stud carried by said sleeve and adapted for sliding engagement within said slot, a post journa-led within said shaft, a top flange upon said sleeve, an annular row of teeth upon the upper face of said flange, a collar upon said post revolubly seated upon the untoothed portion of said flange, two superposed arms mounted upon said post above said collar and being independently rotatable, anda pawl adapted for engaging said teeth carried by the lower one of said arms.

In testimony whereof I afliX mysignature in presence of two witnesses.

FRANK J. TUMA.

Witnesses:

E. S. Evans, W. H. DORIN.

.Gopies of this patent may be obtaineilfor five cents each, by addressing the Commissioner of Patents.

Washington, D. C. 

